Record Display for the EPA National Library Catalog

RECORD NUMBER: 468 OF 635

OLS Field Name OLS Field Data
Main Title Respiration of Aquatic Macrophytes in Eutrophic Ecosystems.
Author McDonnel, Archie J. ; Weete, Dennis W. ;
CORP Author Pennsylvania State Univ., University Park. Inst. for Research on Land and Water Resources.
Year Published 1971
Report Number DI-14-01-0001-1541; OWRR-B-016-PA; 08394,; B-016-PA(2)
Stock Number PB-199 646
Additional Subjects ( Aquatic plants ; Respiration) ; ( Ecology ; Aquatic plants) ; ( Primary biological productivity ; Ecology) ; Food chains ; Oxygen consumption ; Temperature ; Plant physiology ; Diurnal variations ; Streams ; Water pollution ; Eutrophication ; Potamogeton crispus ; Elodea canadensis
Holdings
Library Call Number Additional Info Location Last
Modified
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Status
NTIS  PB-199 646 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. 06/23/1988
Collation 83p
Abstract
Extensive laboratory studies were conducted to evaluate on a seasonal basis the respiratory response of selected aquatic plants to changes in oxygen concentration, temperature, and exogenous nutrient additions. Sampling sites included (1) a nutrient rich stream section which received the effluent from a secondary sewage treatment plant and (2) an unenriched section supported solely by watershed drainage. Test species for the study, which was run in continuous flow and batch type respirometers, included the aquatic macrophytes Potamogeton orispus and Elodea canadensis. Consumption rates were found to be dependent on temperature, state of plant maturity, the oxygen concentration of the test water, and the level of enrichment at the growth site. Consumption rates varied from 0.2 to 2.8 mg 02/gm dry weight/hr for dissolved oxygen concentrations of 0 to 18 mg/1. A methodology is presented to estimate primary productivity in aquatic ecosystems from observations of the diurnal variation of dissolved oxygen incorporating a variable community respiration rate. (LWR)